1 files changed, 15 insertions, 0 deletions
diff --git a/pugl/pugl_internal.h b/pugl/pugl_internal.h
index 88f59f2..74aae55 100644
--- a/pugl/pugl_internal.h
+++ b/pugl/pugl_internal.h
@@ -20,10 +20,25 @@
    Note this file contains function definitions, so it must be compiled into
    the final binary exactly once.  Each platform specific implementation file
    including it once should achieve this.
+
+   If you are copying the pugl code into your source tree, the following
+   symbols can be defined to tweak pugl behaviour:
+
+   PUGL_GRAB_FOCUS: Work around reparent keyboard issues by grabbing focus.
+   PUGL_VERBOSE:    Print GL information to console.
 */
 
 #include "pugl.h"
 
+#ifdef PUGL_VERBOSE
+#    include <stdio.h>
+#    define PUGL_LOG(str)       fprintf(stderr, "pugl: " str)
+#    define PUGL_LOGF(fmt, ...) fprintf(stderr, "pugl: " fmt, __VA_ARGS__)
+#else
+#    define PUGL_LOG(str)
+#    define PUGL_LOGF(fmt, ...)
+#endif
+
 void puglDefaultReshape(PuglView* view, int width, int height);
 
 typedef struct PuglInternalsImpl PuglInternals;